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    • 27. 发明专利
    • MANUFACTURE OF FIBER REINFORCED PLASTIC PIPE
    • JPH0321434A
    • 1991-01-30
    • JP15617989
    • 1989-06-19
    • NIPPON STEEL CORP
    • TSUJI NOBUYUKIMAIKUMA HIRONORIKIMURA HIROMIKUBOMURA KENJI
    • A63B53/10A63B102/32B29C70/06B29K105/06B29L31/52B60K17/22B62K19/16
    • PURPOSE:To facilitate the manufacturing of a pipe having arbitrary shape by a method wherein a bag, in which a core is placed, is prepared so as to cover the outside the bag by resin-impregnated fiber stock and, after that, the whole assembly is transferred in a female die for forming under the state being brought into close contact with the female die internally by applying internal pressure inside the bag and finally the core is removed from the female die. CONSTITUTION:A core 1, the dimensions of which are smaller than the inner diameter of a final molding, is put in a bag 2 made of film-like stock and a fluid inflowing tube 2 is inserted from the mouth of the bag. Next, resin-impregnated fiber stock 3 is wound round the outside of the bag 2, in which the core is placed for hardening and forming. The whole assembly is transferred in a female die 4 and, after that, the female mold is clamped. Next hardening is performed under the the state that the bag 2 is inflated by applying fluid pressure through the fluid inflowing tube 5 so as to bring the resin-impregnated fiber stock 3 into close contact with the inside of the female die 4. After that, the fluid pressure is released and the film is cut open in order to take the core out of the bag. Thus a pipe having arbitrary shape is easily obtained. And the wall thickness of the pipe is controlled so as to have the desired one. A product having high dimensional accuracy can be manufactured at low cost.